AndriodStudio实现保存QQ密码功能(案例代码详解)

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package cn.itcast.saveqq;

import android.content.Context;
import android.content.SharedPreferences;

import java.util.HashMap;
import java.util.Map;

public class SPSaveQQ {
  public static boolean saveUserInfo(Context context,String number,String password){
    SharedPreferences sp = context.getSharedPreferences("data",Context.MODE_PRIVATE);
    SharedPreferences.Editor edit = sp.edit();
    edit.putString("userName",number);
    edit.putString("pwd", password);
    edit.commit();
    return true;
  }
  public static Map getUserInfo(Context context){
    SharedPreferences sp = context.getSharedPreferences("data",Context.MODE_PRIVATE);
    String number = sp.getString("userName", null);
    String password = sp.getString("pwd", null);
    Map userMap = new HashMap();
    userMap.put("number",number);
    userMap.put("password",password);
    return userMap;
  }
}

package com.example.kh11;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Map;
import cn.itcast.saveqq.SPSaveQQ;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
  private EditText etNumber;
  private EditText etPassword;
  private Button btnLogin;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化界面
    initView();
    Map userInfo = SPSaveQQ.getUserInfo(this);
    if(userInfo != null){
      etNumber.setText(userInfo.get("number"));
      etPassword.setText(userInfo.get("password"));
    }
  }
  private void initView(){
    etNumber = (EditText) findViewById(R.id.et_number);
    etPassword = (EditText) findViewById(R.id.et_password);
    btnLogin = (Button) findViewById(R.id.btn_login);
    //设置按钮的点击事件
    btnLogin.setOnClickListener(this);
  }
  @Override
  public void onClick(View v) {
    //当单机登录按钮时，获取QQ账号和密码
    String number = etNumber.getText().toString().trim();
    String password = etPassword.getText().toString();
    //检验账号和密码是否正确
    if(TextUtils.isEmpty(number)){
      Toast.makeText(this,"请输入QQ账号",Toast.LENGTH_SHORT).show();
      return;
    }
    if(TextUtils.isEmpty(password)){
      Toast.makeText(this,"请输入密码",Toast.LENGTH_SHORT).show();
      return;
    }
    //登陆成功
    Toast.makeText(this,"登陆成功",Toast.LENGTH_SHORT).show();
    //保存用户信息
    boolean isSaveSuccess = SPSaveQQ.saveUserInfo(this,number,password);
    if(isSaveSuccess){
      Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();
    }else{
      Toast.makeText(this,"保存失败",Toast.LENGTH_SHORT).show();
    }
  }
}